Device for adjusting the recoil length of fluid brakes for gun carriages



N.. KOCH. DEVICE FOR ADJUSTING THE RECOIL LENGTH OF FLUID BRAKES FOR GUNCARRIAGES.

Patented May 30, 1922.

APPLICATION FILED FEB 3, 1915- i3 if (a NOBBEB'I KOCH, OFESSEN-RELLINGHAUSEN, GERMANY, ASSIGNOR, BY IVIESNE ASSIGNMENTS, TO THEALIEN PROPERTY CUSTODIAN.

DEVICE FOR ADJUSTING THE RECOIL LENGTH OF FLUID BRAKES FOB GUNGARR'IAGES.

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Specification of Letters Patent.

Patented May 31), 31922.

Application filed February 3, 1915. Serial No. 5,900.

To aZZ whom it may concern Be it known that I, Nonnnn'r K001i, residingat Essen-Fellinghausen, Germany, a citizen of the German Empire, haveinvented a certain new and useful Improvement in Devices for Adjustino'the Recoil Length of Fluid Brakes for un Carriages, of which thefollowing is a specification.

The present invention relates to fluid recoil brakes for gun carriagesof the same character as those described in the copending applicationfor Letters Patent Serial No. 822,656 filed March 5th, 1914, that is guncarriages having a device for adjusting the recoil length according tothe elevation of the gun and tor varying the crossv section of the fluidpassages. The object of the present invention is now the furtherimprovement of such devices.

One embodiment of the present invention is illustrated in theaccompanying drawing where- Figure 1 shows a longitudinal section of thebrake piston and a portion oi the cylinder;

Figure 2 a section along line 2-2 of: Figure I seen from the left;

Figure 3 a section along line 3-3 of Figure 2;

Figure e a section along line 4- & of Figure 3, seen from the left;

Figure 5 a section along line 5-5 of Figure 1 seen from the lett;

Figure 6 a section along line 66 of Figure 3 seen from the left andFigure 7 a diagrammatic representation of the brake in smaller scale.

The piston head B having a hollow chamber b and a piston rod B is guidedin the brake cylinder A. On the inner wall of the brake cylinder A areout two pairs of longitudinal grooves a and (6, which follow a screwline of such pitch that one end of each groove is displaced relative toits other end an amount which corresponds to the width of the groove inquestion. The grooves a have about twice the width of the grooves a F orconnecting the grooves a and a with the fluid in frontand rear of thepiston head B, are provided two pairs of apertures b 7) in the pistonhead having the same width on the cylindrical surface of the piston headas the grooves (4 measured transversely to the longitudinal direction ofthe brake. To insure that the fluid only proceeds by way of theapertures Z9 b from one side to the other of the piston head, there areprovided on the latter two revoluble but non-:-;lidable rings C, (1'having studs 0 and engaging in the grooves a and a and being secured inplace by means of nuts 2 and Z).

When the apertures 6 7) have the position shown particularly in Figures,5 and 7 relative to the grooves a, a corresponding to the hatchedposition 1 in Figure I", the recoil oi the piston B taking place in thedirection of the arrow 0;, the brake fluid then proceeds from the pistonrod side of the brake cylinder through the grooves a and a and theapertures 0 Z) to the other side covered by the inner wall of thecylinder, see

position II in Figure 7, no more fluid will then be able to pass. Therecoiling parts will therefore be arrested. This, however, takes placeonly after the piston has completed its full (normal) stroke, that isthe longest recoil, as a consequence of the size of the grooves 64 andIn the above described setting of the brake, the area of the orifice forthe brake fluid is, towards the end of the recoil, comparatively great,so that the brake pressure does not exceed the amount, which ispermissible for the rapidly decreasing stability of the carriage duringthe recoil of the gun under slight elevation.

If a recoil is desired, the length of which amounts to about hali of thenormal length, the piston rod has then to be turned by hand orautomatically in the direction of the arrow 3 Figure 5, an angle whichcorresponds to the width of the grooves 54 The apertures b are thencompletely covered by the inner wall of the brake cylinder, Whilst theapertures take the position relative to the grooves (6 represented bydot and dash lines in Figure 6. In Figure 7 is the correspondingposition of the apertures indicated by III. For the transmission of thebrake fluid at the beginning of the recoil is then only available thesectional area formed by the apertures 6 which, during the recoil become gradually restricted, and at last completely closed, when theapertures b have reached the position relative to the grooves a denotedby IV in Figure 7. As no transmission of the brake fluid is any longerpos sible, the moving parts will become arrested.

As consequence of the covering o1 the apertures b by the inner wall ofthe brake cylinder, it has been attained that the sectional area for thebrake fluid during the shortest recoil is less than during the long estrecoil. The shape of the apertures 77* has therefore been so selected,that when these apertures have been closed, the recoil energy will becompletely exhausted.

Besides the normal recoil length and the one which will obtain with thelast described setting of the brake, it will be obvious, that any otherrecoil length between the permissible shortest and the normal length,may be had, by corresponding adjustment of the piston rod. I

I claim l. A device for adjusting the recoil length in fluid recoilbrakes, having a piston and a part cooperating with the piston, saidpart being providedv with a primary helical groove and .a secondaryhelical groove, and said piston with a primary aperture and a secondaryaperture corresponding, respectively, to said primary and secondarygrooves; said primary groove and aperture operating during all recoillengths, and said secondary groove and aperture being of less crosssectional area than the aforesaid primary groove and aperture, and beingout of operation during the shortest recoil.

2. A device for adjusting the recoil length in fluid recoil brakes,having a piston and a part cooperating with the piston,.said part beingprovided with a primary helical groove and a secondary helical groove,and said piston with a primary aperture and a secondary aperturecorresponding respectively, to said primary and secondary grooves; saidprimary groove and aperture operating during all recoil lengths, andsaid secondary groove and aperture being out of operation during theshortest recoil; said primary groove being approximately twice as Wideas said secondary groove.

A device for adjusting the recoil length in fluid recoil brakes, havinga piston and a part cooperating With the piston, said part beingprovided with a primary helical groove and a secondary helical groove,and said piston With a primary aperture and a secondary aperturecorresponding, respectively, to said primary and secondary grooves; saidprimary groove and aperture operating during all recoil lengths, andsaid secondary groove and aperture being out of operation during theshortest recoil; said primary groove having greater pitch than saidsecondary groove. 7 r r 4. A devicei or adjusting the recoil length influid recoil brakes, having a piston and a part cooperating with thesiston, said part being provided with a primary helical groove and asecondary helical groove, and said piston with a primary aperture and asecondary aperture corresponding respectively, to said primary andsecondary grooves; said primary groove and aperture operating during allrecoil lengths, and said secondary groove and aperture being out ofoperation during the shortest recoil; said primary groove havingapproximately double the Width of and a greater pitch than saidsecondary groove.

5. A device for adjusting the recoil length in fluid recoil brakes,having a piston and a part cooperating with the piston, said part beingprovided with a primary helical groove and a secondary helical groove,and said piston With a primary aperture and a secondary aperturecorresponding, respectively, to said primary and secondary grooves; saidprimary groove and aperture operating during all recoil lengths, andsaid secondary groove and aperture being out of operation during theshortest recoil; said primary groove having approximately double theWidth of and a greater pitch than said secondary groove; said primaryand secondary apertures having the same transverse Width as thesecondary groove.

The foregoing specification signed at Barmen, Germany, this 16th day oiDec,

NORBERT KOCH. [It s] In presence of- HELEN Nnrnn, ALBERT NU'FER.

